91913849 has 18 divisors (see below), whose sum is σ = 103164894. Its totient is φ = 81861120.

The previous prime is 91913839. The next prime is 91913867. The reversal of 91913849 is 94831919.

It can be written as a sum of positive squares in 3 ways, for example, as 22024249 + 69889600 = 4693^2 + 8360^2 .

It is a de Polignac number, because none of the positive numbers 2^k-91913849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91913839) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 103889 + ... + 104769.

It is an arithmetic number, because the mean of its divisors is an integer number (5731383).

Almost surely, 2^91913849 is an apocalyptic number.

It is an amenable number.

91913849 is a deficient number, since it is larger than the sum of its proper divisors (11251045).

91913849 is a wasteful number, since it uses less digits than its factorization.

91913849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 953 (or 917 counting only the distinct ones).

The product of its digits is 69984, while the sum is 44.

The square root of 91913849 is about 9587.1710634577. The cubic root of 91913849 is about 451.2947877983.

The spelling of 91913849 in words is "ninety-one million, nine hundred thirteen thousand, eight hundred forty-nine".